PEI modified orange emissive carbon dots with excitation-independent fluorescence emission for cellular imaging and siRNA delivery

Li, Rui; Wei, Fangdi; Xi-sheng, WU; Zhou, Ping; Chen, Qiutong; Yao, Chuang; Xu, Guanhong; Cheng, Xin‐Bing; Zhang, Aixia; Hu, Qin

doi:10.1016/j.carbon.2021.02.069

Cited by 65 publications

(42 citation statements)

References 61 publications

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“…The emission wavelengths of B-CQDs and C-CQDs mainly concentrate in the UV region, while those of G-CQDs and Y-CQDs extend from the UV to the visible region, demonstrating an evident red-shift PL behavior from B-CQDs to Y-CQDs. Furthermore, it can be found that B-CQDs and C-CQDs present the most obvious excitation-dependent behavior, and the G-CQDs exhibit a weak excitation dependence, which is considered to be related to the diverse surface defects such as oxygen, nitrogen, and sulfur functional groups. − The Y-CQDs with the invariable position of emission peaks show almost excitation-independent behavior, indicating fewer surface-state defects. − The UV–vis absorption spectra of the four CQDs present a similar absorption peak at 200–300 nm, which is ascribed to the π–π* transition of CC in the sp 2 core. Notably, the absorbance of G-CQDs and Y-CQDs is stronger than that of B-CQDs and C-CQDs, indicating more CC groups in their carbon core. , The weak absorption shoulder at 300–450 nm is attributed to the n−π* transition of CO or CN on the surface .…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Tunable Fluorescent Carbon Quantum Dots from Lignin and Their Application in Anti-Counterfeit Printing

Zhu

Shen

Wang

et al. 2021

ACS Appl. Mater. Interfaces

109

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Lignin converted to carbon quantum dots (CQDs) attracts tremendous attention for large-scale production of carbon nanomaterials and value-added disposal of biomass wastes (such as the black liquor from pulping industry and the residue from hydrolysis of biomass). The green synthesis of lignin-derived CQDs is reported via a facile two-step method with the adjustment of acid additives containing N or S. The resulting series of CQDs exhibit bright fluorescence in gradient colors from blue to yellowish green, among which the N, S co-doped CQDs with the addition of 2,4-diaminobenzene sulfonic acid show an optimal fluorescence quantum yield (QY) of 30.5%. The red-shift photoluminescence emission behaviors of these CQDs can be attributed to the increased graphitization degree and reduced optical energy band gaps (2.47 → 2.17 eV) with regard to the incorporation of various heteroatoms. The improved fluorescence QYs are consistent with the variation trend of the increased N/C content in the CQDs. The yellowish green-emissive CQDs with bright fluorescence, strong water solubility, and excellent chemical stability perform well in anti-counterfeiting printing. The promising and sustainable approach for the synthesis of tunable fluorescent CQDs exhibits the value-added utilization of lignin for the fluorescence ink production.

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Section: Resultsmentioning

confidence: 99%

Green Synthesis of Tunable Fluorescent Carbon Quantum Dots from Lignin and Their Application in Anti-Counterfeit Printing

Zhu

Shen

Wang

et al. 2021

ACS Appl. Mater. Interfaces

109

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“…The G‐band at ≈1550 cm −1 is due to the sp 2 bonded graphitic carbons, and the D‐band at ≈1346 cm −1 reveals a reduction in the symmetry of graphitic lattices due to the introduction of nitrogen atoms. [ 50 ] The intensity ratio of D‐ and G‐band ( I D / I G ) of NCDs‐PEI is calculated to be 1.09, which is larger than that of NCDs (0.97). The increase of the I D / I G value may be ascribed to abundant surface defects in NCDs‐PEI.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Polarization and Dual Charge Transfer Induced High Permittivity of Carbon Dots‐Based Composite as Humidity‐Resistant Tribomaterial for Efficient Biomechanical Energy Harvesting

Han

et al. 2021

Advanced Energy Materials

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Tribopositive, scalable, and biocompatible materials are highly desired for high‐performance triboelectric nanogenerators (TENGs). In this study, polyethylenimine (PEI) functionalized N‐doped carbon dots (NCDs‐PEI) are synthesized and a novel approach to develop high‐output TENGs by incorporating high permittivity NCDs‐PEI into polyvinyl alcohol (PVA) as the tribopositive composite (CPP composite) is proposed for the first time. By systematically manipulating the mass ratio of NCDs/PVA and PEI‐functionalized concentration, the optimized CPP composite‐based TENGs (CPP‐TENGs) reveal a remarkable enhancement in power density by 28.5 times as compared with pure PVA‐based TENGs. The considerable electric outputs of CPP‐TENGs can be attributed to the synergistic effect of interfacial polarization enhanced permittivity of CPP composite and boosted surface charge density induced by dual charge transfer pathways. Moreover, CPP‐TENGs present superior high‐output stability, durability, and humidity‐resistance, and can also effectively drive electronics at different humidity and monitor human body movements. This work renders a simple, feasible, and scalable pathway to boost the electrical performance of TENGs for biomotion energy harvesting as well as providing insights for exploiting novel tribomaterials in the development of high‐output TENGs.

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“…Specifically, CDs have become striking photothermal agents since they contain a large amount of π electrons. [186] In order to achieve more effective tumor treatment, people have conducted extensive researches on the selective administration of anticancer drugs in recent years. Enhanced permeability and retention (EPR)-based tumor therapy has been widely used in pre-clinical and clinical research.…”

Section: Cancer Therapy Applications Of Cdsmentioning

confidence: 99%

“…Specifically, CDs have become striking photothermal agents since they contain a large amount of π electrons. [ 186 ]…”

Section: Biological Applicationsmentioning

confidence: 99%

Carbon dots: An innovative luminescent nanomaterial

Shi

Yuan

et al. 2021

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In recent years, carbon dots (CDs), including carbon nanodots, carbonized polymer dots, carbon quantum dots, and graphene quantum dots have attracted a mounting interest as readily accessible, nontoxic, and relatively inexpensive carbon-based nanomaterials. Yet, despite intense research for a number of years, a unifying picture is still lacking to clarify the exact definition, clear chemical structure, and unique optical properties of this family of nanomaterials. In this review, we systematically summarize the recent development of CDs from molecular design to related properties of excited states as well as their applications in optoelectronic devices and biology. We point out the current challenges, including exploring precise synthesis, clarifying the structure-property relationship, and regulating singlet and triplet states of fluorescence, phosphorescence, and delayed fluorescence. Moreover, the structural optimization of optoelectronic devices, tumor targeting mechanism, selective imaging, and drug delivery of CDs are also highlighted. We hope that the information provided in this review will inspire more exciting research on CDs from a brand-new perspective and promote practical application of CDs in multiple directions of current and future research.

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PEI modified orange emissive carbon dots with excitation-independent fluorescence emission for cellular imaging and siRNA delivery

Cited by 65 publications

References 61 publications

Green Synthesis of Tunable Fluorescent Carbon Quantum Dots from Lignin and Their Application in Anti-Counterfeit Printing

Green Synthesis of Tunable Fluorescent Carbon Quantum Dots from Lignin and Their Application in Anti-Counterfeit Printing

Interfacial Polarization and Dual Charge Transfer Induced High Permittivity of Carbon Dots‐Based Composite as Humidity‐Resistant Tribomaterial for Efficient Biomechanical Energy Harvesting

Carbon dots: An innovative luminescent nanomaterial

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